#include<stdio.h>
intmain()
{
     int years:
     scanjf("%d", &years);
     if(years<1)
       printf("Invalid Input");
       else if(years >= 1 && years <=5)
       printf("5%%");
       else if (years >=6 && years <= 10)
       printf("10%%");
       else if (years > 10)
       printf("15%%");
       return 0;
}